Ah, I hadn't noticed that it went to a different process number after 5. I 
guess I was reading the logs wrong. My apologies. I'm still a bit confused why 
the bounce messages have all 40+ RoadRunner members in them. It's like 
RoadRunner/Charter/Spectrum is stitching them all back together?

> That's five recipients with PID=1046597 and delays=1.3.
>
>> 2026-06-26T17:58:27.203545+00:00 mail postfix-slow/smtp[1046598]: 
>> 89A2C82E43: [email protected]>, 
>> relay=pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7]:25, delay=1.6, 
>> delays=0.3/0.92/0.33/0.08, dsn=4.1.0, status=deferred (host 
>> pkvw-mx.msg.pkvw.co.charter.net[47.43.26.7] said: 452 4.1.0 
>> <[email protected]> server temporarily unavailable 
>> AUP#In-1390 (in reply to MAIL FROM command))

By the way, that error code AUP#In-1390 has the following definition:

Spam prevention means that email features and settings are subject to limits on 
the number of:

Messages that can be sent at one time.
Different email recipients.
Invalid email addresses. 
If you get one of these email errors, you've exceeded one or more of these 
limits. Please adjust the message you're trying to send and try again.

Sure wish they'd tell me what those limits actually are.


>
> You may want to specify slow_smtp_destination_rate_delay to slow things 
> further down.

Thanks, I'll give that a try. Do I need to do anything with 
slow_smtp_destination_concurrency_failed_cohort_limit? I must admit I'm kind of 
baffled about what that one does.


-- 
Paul Tomblin
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